In ΔABC, ∠A – ∠B = 33° and ∠B – ∠C = 18°. Find the measure of each angle of the triangle.
Given: ∠A – ∠B = 33°
⇒ ∠A = 33° + ∠B
∠B – ∠C = 18°
⇒ ∠C = ∠B – 18°
We know the sum of angles in a triangle is 180°.
⇒ ∠A + ∠B + ∠C = 180°
⇒ (33° + ∠B) + ∠B + (∠B – 18°) = 180°
⇒ 3∠B + 15° = 180°
⇒ 3∠B = 165°
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Now, ∠A = 33° + ∠B
⇒ ∠A = 33° + 55° = 88°
Also, ∠C = ∠B – 18°
⇒ ∠C = 55° – 18° = 37°
Thus, ∠A = 88°, ∠B = 55° and ∠C = 37°.
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